A Republican former secretary of state and a Democratic "Jewish mother" may have just given us the strongest case yet for the nuclear agreement with Iran. The first is a pillar of the "realist" camp in the American national security establishment. The second is a rising star in the Democratic Party from a heavily Jewish district in South Florida. Together, they represent key constituencies whose support for the historic accord is critical to isolating right-wing opponents and preventing last-minute sabotage attempts. Together, they also lay out a compelling narrative of why the agreement is so important to American national security.